Java Utililty Methods XML Node to String

String textContent = node.getTextContent();
StringBuilder buf = new StringBuilder();
if (textContent != null) {
    short nodeType = node.getNodeType();
    switch (nodeType) {
    case Node.TEXT_NODE: {
        buf.append(textContent);
        break;
...

return nodeToString(node, (pretty ? 0 : -1));

StringBuilder b = new StringBuilder();
if (node == null) {
    return "";
if (node instanceof Element) {
    Element element = (Element) node;
    b.append("<");
    b.append(element.getNodeName());
...

TransformerFactory transFactory = TransformerFactory.newInstance();
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
DOMSource dSource = new DOMSource(node);
StringWriter sw = new StringWriter();
StreamResult sr = new StreamResult(sw);
transformer.transform(dSource, sr);
StringWriter anotherSW = (StringWriter) sr.getWriter();
...

int type = node.getNodeType();
switch (type) {
case Node.DOCUMENT_NODE:
    sb.append("<?xml version=\"1.0\" ?>"); 
    nodeToString(((Document) node).getDocumentElement(), sb);
    break;
case Node.ELEMENT_NODE:
    sb.append("<"); 
...

String result = "";
if (node instanceof String) {
    String str = ((String) node).replaceAll("\\s+", " ").trim();
    result += str;
} else if (node instanceof Text) {
    String str = ((Text) node).getTextContent().replaceAll("\\s+", " ").trim();
    result += str;
} else if (node instanceof Element) {
...

if (domNode == null) {
    return "";
String s = typeName[domNode.getNodeType()];
String nodeName = domNode.getNodeName();
if (!nodeName.startsWith("#")) {
    s += ": " + nodeName;
if (domNode.getNodeValue() != null) {
    if (s.startsWith("ProcInstr"))
        s += ", ";
    else
        s += ": ";
    String t = domNode.getNodeValue().trim();
    int x = t.indexOf("\n");
    if (x >= 0)
        t = t.substring(0, x);
    s += t;
return s;

StringBuffer buffer = new StringBuffer();
if (node instanceof Text) {
    Text text = (Text) node;
    buffer.append(text.getData());
    buffer.append(' ');
} else {
    NodeList list = node.getChildNodes();
    for (int i = 0; i < list.getLength(); i++) {
...

TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.INDENT, "no");
DOMSource source = new DOMSource(node);
StreamResult result = new StreamResult(writer);
...

try {
    Transformer t = TransformerFactory.newInstance().newTransformer();
    t.setOutputProperty(OutputKeys.INDENT, "yes");
    DOMSource source = new DOMSource(node);
    StreamResult result = new StreamResult(new StringWriter());
    t.transform(source, result);
    return result.getWriter().toString();
} catch (TransformerException e) {
...